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From "Claudio Tagliola (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3755) receiveNoWait blocked on same mutex as sending threads
Date Fri, 02 Mar 2012 12:28:56 GMT
receiveNoWait blocked on same mutex as sending threads
------------------------------------------------------

                 Key: AMQ-3755
                 URL: https://issues.apache.org/jira/browse/AMQ-3755
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.5.0
            Reporter: Claudio Tagliola


We have a server processing requests with an internal broker, connected with a vm transport.
At a certain load and a high number of clients (approx. 350 clients) we see our server congested
towards the internal VM broker. By looking at the stacktraces, it seems the incoming reading
thread is waiting for a lock obtained by one of several other threads. This resulted in a
short period (around 20-30 seconds) of very sluggish response times towards our clients. Response
times of _any_ request through ActiveMQ go from a normal <50ms response time towards 2
seconds.

Below is an extract of a stackdump while this happened. The first stacktrace is the thread
trying to read incoming messages with a receiveNoWait, but it is blocked by the first thread,
which the second thread owns. The third and fourth are two other processes, all waiting for
the same mutex. These four processes are - from our server's perspective - not related to
each other:
{noformat}
"RoundRobinReceiver" prio=10 tid=0x00007f1030483800 nid=0x2a59 waiting for monitor entry [0x00007f1075f5b000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:39)
	- waiting to lock <0x00000006bb6028b0> (a java.lang.Object)
	at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
	at org.apache.activemq.ActiveMQConnection.doAsyncSendPacket(ActiveMQConnection.java:1265)
	at org.apache.activemq.ActiveMQConnection.asyncSendPacket(ActiveMQConnection.java:1259)
	at org.apache.activemq.ActiveMQSession.asyncSendPacket(ActiveMQSession.java:1863)
	at org.apache.activemq.ActiveMQSession.sendAck(ActiveMQSession.java:2029)
	at org.apache.activemq.ActiveMQSession.sendAck(ActiveMQSession.java:2024)
	at org.apache.activemq.ActiveMQMessageConsumer.afterMessageIsConsumed(ActiveMQMessageConsumer.java:871)
	- locked <0x0000000715bda898> (a java.util.LinkedList)
	at org.apache.activemq.ActiveMQMessageConsumer.receiveNoWait(ActiveMQMessageConsumer.java:617)
	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener.readFromConsumer(JMSRoundRobinListener.java:200)
	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener.roundRobinOverQueueConsumers(JMSRoundRobinListener.java:173)
	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener.receiveMessagesUntilInterrupt(JMSRoundRobinListener.java:109)
	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener.access$200(JMSRoundRobinListener.java:22)
	at com.foo.bar.impl.server.services.jms.JMSRoundRobinListener$RoundRobinReceiver.run(JMSRoundRobinListener.java:248)
	at java.lang.Thread.run(Thread.java:722)

"ResultPublisher1" prio=10 tid=0x00007f0f20003000 nid=0x2b31 waiting on condition [0x00007f1060d59000]
   java.lang.Thread.State: WAITING (parking)
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000006bb600410> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
	at java.util.concurrent.LinkedBlockingQueue.put(LinkedBlockingQueue.java:349)
	at org.apache.activemq.transport.vm.VMTransport.oneway(VMTransport.java:94)
	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:40)
	- locked <0x00000006bb6028b0> (a java.lang.Object)
	at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
	at org.apache.activemq.ActiveMQConnection.doAsyncSendPacket(ActiveMQConnection.java:1265)
	at org.apache.activemq.ActiveMQConnection.asyncSendPacket(ActiveMQConnection.java:1259)
	at org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1744)
	- locked <0x00000006bc4bd448> (a java.lang.Object)
	at org.apache.activemq.ActiveMQMessageProducer.send(ActiveMQMessageProducer.java:231)
	at org.apache.activemq.ActiveMQMessageProducerSupport.send(ActiveMQMessageProducerSupport.java:241)
	at com.foo.bar.impl.server.services.jms.MappingResultPublisher.publishResponse(MappingResultPublisher.java:66)
	at com.foo.bar.impl.server.services.jms.QueuedMappingResultPublisher.executeJob(QueuedMappingResultPublisher.java:44)
	at com.foo.bar.impl.server.services.mapper.AbstractQueuedMappingJobExecutor.processJob(AbstractQueuedMappingJobExecutor.java:120)
	at com.foo.bar.impl.server.services.mapper.AbstractQueuedMappingJobExecutor.access$100(AbstractQueuedMappingJobExecutor.java:23)
	at com.foo.bar.impl.server.services.mapper.AbstractQueuedMappingJobExecutor$1.run(AbstractQueuedMappingJobExecutor.java:105)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:722)

"RemoteResolveRequestService-ReplierThread-1" prio=10 tid=0x00007f1030485000 nid=0x2a5a waiting
for monitor entry [0x00007f1075e5a000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:39)
	- waiting to lock <0x00000006bb6028b0> (a java.lang.Object)
	at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
	at org.apache.activemq.ActiveMQConnection.doAsyncSendPacket(ActiveMQConnection.java:1265)
	at org.apache.activemq.ActiveMQConnection.asyncSendPacket(ActiveMQConnection.java:1259)
	at org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1744)
	- locked <0x00000006baf131f8> (a java.lang.Object)
	at org.apache.activemq.ActiveMQMessageProducer.send(ActiveMQMessageProducer.java:231)
	at org.apache.activemq.ActiveMQMessageProducerSupport.send(ActiveMQMessageProducerSupport.java:300)
	at com.foo.bar.remoteservices.server.RpcReplierTask.sendReply(RpcReplierTask.java:129)
	at com.foo.bar.remoteservices.server.RpcReplierTask.run(RpcReplierTask.java:103)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:722)

"PersistEntityMessagePublisherThread" daemon prio=10 tid=0x00007f1030b70800 nid=0x2a4b waiting
for monitor entry [0x00007f1076c68000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:39)
	- waiting to lock <0x00000006bb6028b0> (a java.lang.Object)
	at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
	at org.apache.activemq.ActiveMQConnection.doAsyncSendPacket(ActiveMQConnection.java:1265)
	at org.apache.activemq.ActiveMQConnection.asyncSendPacket(ActiveMQConnection.java:1259)
	at org.apache.activemq.ActiveMQSession.send(ActiveMQSession.java:1744)
	- locked <0x00000006bc542e90> (a java.lang.Object)
	at org.apache.activemq.ActiveMQMessageProducer.send(ActiveMQMessageProducer.java:231)
	at org.apache.activemq.ActiveMQMessageProducerSupport.send(ActiveMQMessageProducerSupport.java:241)
	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher.sendMessage(PersistEntityMessageBackgroundPublisher.java:140)
	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher.sendMessage(PersistEntityMessageBackgroundPublisher.java:132)
	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher.forwardMessagesToTopic(PersistEntityMessageBackgroundPublisher.java:101)
	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher.access$000(PersistEntityMessageBackgroundPublisher.java:22)
	at com.foo.bar.impl.server.services.PersistEntityMessageBackgroundPublisher$1.run(PersistEntityMessageBackgroundPublisher.java:49)
	at java.lang.Thread.run(Thread.java:722)
{noformat}
My question is: why is the receiving of messages blocked by the other threads and why do they
share a single mutex? Is there anything I can do to alleviate this problem?

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